let node = {
	"bucket": {
		"bucket_id": 4919,
		"account_id": 3449,
		"bucket_name": "existbucket",
		"form_api_secret": null,
		"form_api_private_secret": null,
		"storage": 200,
		"created_at": 1417253790,
		"type": "CDN",
		"charge_mode": "DISCHARGE",
		"visible": true,
		"domain_whitelist_enabled": false,
		"domain_blacklist_enabled": false,
		"url_blacklist_enabled": false,
		"ip_block_enabled": false,
		"user_agents_enabled": false,
		"user_token_enabled": false,
		"https": 0,
		"https_created_at": 0,
		"page_403": null,
		"page_404": null,
		"page_405": null,
		"log_split": 0,
		"updated_at": 1417253790,
		"status": "NORMAL",
		"version": null,
		"mig": false,
                "fusion_cdn": false,
                "security_cdn": false,
                "default_domain": "existbucket.b0.upaiyun.com"
	}
}

const { bucket } = node;
console.log('bucket:' + bucket.account_id);

const array = [];
array.push(bucket.account_id);
console.log('array:' + array);